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Velocity problems

I am working on my friends mag it has a xvalve with level 10. with the gold spring with it turned all the way up it shoots around 225 with the red spring the best I can get it to is 265 and it wont shoot with the silver spring. because I have never had a velocity problem with a mag this is a new problem for me does anyone have any other suggestions, the valve and all orings look to ge in great shape, almost like new.

When you say turned up all the way you mean as far as it goes without venting from the rear right? I've seen this twice.
Case a) Needed new reg-piston assembly
Case b) Tank output was in the 550 range (should be 800 minimum with LX/RT)

ptp micro emag does the same in e and mech mode, 1500psi or better every time I have tested it, and I was going to try switching valves but first I have to adjust the level 10 in the other valve before I try that.

Ok I have tried the valve in another gun and it works fine and I have tried a different valve in the gun and it is shooting low. so it appears to be the gun, how can I change the gun to fix that problem?